The effect of Oxygen sUppleTion on vascular resistance and FLOW: the OUTFLOW study
The OUTFLOW study is exploring how giving people pure oxygen affects their heart and blood vessels. It's for individuals living with conditions such as pulmonary hypertension (high blood pressure in the lungs), issues with the small blood vessels around the heart (coronary microvascular dysfunction), low oxygen levels (hypoxia), and heart failure. The main goal is to see how much blood the heart pumps at different times after receiving oxygen. They will also be checking other important measures like blood flow, pressure in the heart, and how easily blood flows through the lungs and body. This is a Phase IV study, meaning the treatment (oxygen) is already approved and used, but researchers want to understand its effects better in these specific patient groups.
At a glance
What is this study about?
This research project, known as the OUTFLOW study, is looking into how giving pure oxygen affects people who have certain heart and lung problems. These include conditions where the blood pressure in the lungs is too high (pulmonary hypertension), or where the tiny blood vessels that supply the heart aren't working properly (coronary microvascular dysfunction). It also involves people with low oxygen levels in their body or heart failure.
The main aim of the study is to understand if and how oxygen affects how much blood your heart pumps out each minute. They will measure this after you have been given oxygen. The oxygen used in the study is a medical-grade liquid oxygen called Conoxia® Vloeibaar.
This is a 'Phase IV' study, which means the oxygen treatment is already widely used in hospitals and clinics. The researchers are not testing a new medication, but rather trying to learn more about how oxygen affects the body in people with these specific conditions. This deeper understanding could help doctors in the future to better manage symptoms and improve the care for these conditions.
Key takeaways
- The OUTFLOW study investigates how oxygen affects heart and blood vessels.
- It's for people with pulmonary hypertension, microvascular dysfunction, hypoxia, or heart failure.
- The study measures how much blood the heart pumps after receiving oxygen.
- This is a Phase IV study, learning more about an existing treatment.
- Participation involves receiving oxygen and having heart function monitored.
- It aims to improve future care for these conditions.
Who may be eligible?
To be considered for this study, you need to be at least 18 years old. There is no upper age limit, meaning older adults can also take part. The study is open to both men and women.
The researchers are specifically looking for people who have been diagnosed with one or more of the following serious conditions: high blood pressure in the lungs (pulmonary hypertension), problems with the tiny blood vessels of the heart (coronary microvascular dysfunction), persistently low oxygen levels (hypoxia), or heart failure.
It's important to note that while these are the basic requirements, a doctor from the study team will need to review your full medical history to confirm if this study is suitable for you. This ensures your safety and that the study can gather meaningful results.
Could this study suit you?
Answer these quick questions to see if you may be eligible. This is a guide only — the research team makes the final call.
- Are you 18 years old or older?
- Do you have pulmonary hypertension?
- Do you have coronary microvascular dysfunction?
- Do you experience hypoxia (low oxygen levels)?
- Do you have heart failure?
- Are you comfortable with receiving pure oxygen for measurements?
What does participation involve?
If you decide to take part in the OUTFLOW study, you would receive medical-grade pure oxygen. During this time, researchers would carefully measure how your heart and blood vessels respond. This involves measuring how much blood your heart pumps at different points – before you receive oxygen, and then after 5 and 10 minutes of receiving it. They will also be tracking other important details like your blood flow, the pressure inside your heart, and how easily blood flows through your lungs and body. These measurements would likely be taken using standard hospital equipment. There isn't information provided about the total number of visits or the overall duration of your participation, but these details would be fully explained to you by the study team.
Potential risks and benefits
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Common questions
What is pulmonary hypertension?
It's a serious condition where the blood pressure in the arteries going from your heart to your lungs is too high.
What does 'coronary microvascular dysfunction' mean?
This means there's a problem with the tiny blood vessels that supply your heart muscle, which can affect its function.
What is 'hypoxia'?
Hypoxia means that parts of your body, or your whole body, are not getting enough oxygen.
What is 'Phase IV' in a clinical trial?
Phase IV means the treatment (in this case, oxygen) is already approved and available, and researchers are gathering more information about its effects or side effects in specific groups of people.
Will I be given a new drug?
No, you will be given medical-grade pure oxygen, which is already a standard treatment. The study aims to understand its effects better.
How to find out more
Always speak to your GP or specialist before deciding to take part in a study.
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